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(11) | EP 1 577 832 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Image processing apparatus for correcting distortion of image and image shooting apparatus for correcting distortion of shot image |
| (57) A digital camera (1) acquires the image of an original including an original (2)
from a shot image acquired by shooting. The digital camera (1) reduces the image of
the original and corrects distortion of the reduced image which is originated from
the characteristic of a lens. As the digital camera (1) performs distortion correction
on the reduced image, the number of arithmetic operations in distortion correction
is reduced, making distortion correction simpler. The digital camera (1) acquires
a rectangle defined by the contour of the original (2), extracts the image of the
original to acquire an original image before reduction, and acquires an associated
projection-transformed image by affine transformation. The digital camera (1) acquires
pixel positions of the original image using an affine parameter, and acquires pixel
positions of the image before distortion correction using a relational expression
of distortion correction performed on the reduced image.
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